The Happy Birthday Cake LED Pin Blinkie is the perfect way to say "Happy Birthday!" without having to say anything at all, it's just that bright. Perfect for: corporate birthday parties, large event birthdays, commemorations, the corporate head honcho's big birthday and so much more! LED colors: 1 yellow, 2 blue and 2 red. LED function: scrolling flash (top to bottom). Includes 2 replaceable CR927 batteries.